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POWER AMPLIFIER (IC101: LA4598)
The power amplifier is a two-channel amplifier with standby switch.
The following table shows the pin function of IC101.
FILTER BLOCK
Since the sound signals from the CPU is stepped waveforms, the filter block is added to smooth the waveforms.
Amp.
LA4598
Filter
Block
CPU
MSM6755B-17
Pin No.
Terminal
In/Out
Function
1
Power
GND
In Ground (0 V) source
2
Ch1 B.S.
—
Terminal for a bootstrap capacitor
3
Ch1 OUT
Out
Channel 1 output
4
VCC
In
+9 V source
5
Ch1 N.F.
In
Negative feedback input
6
Ch1 IN
In
Channel 1 input
7
D.C.
—
Terminal for a decoupling capacitor
8
Pre GND
In
Ground (0 V) source
9
Stand by
In
Power control signal input. 0 V: Off, +9 V: On
10
Ch2 IN
In
Channel 2 input
11
Ch2 N.F.
In
Negative feedback input
12
Ch2 OUT
Out
Channel 2 output
13
Ch2 B.S.
—
Terminal for a bootstrap capacitor
14
NC
—
Not used
Содержание CTK-485
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